Claude Code v2.1.224 adds cross-session agent messaging
Anthropic released Claude Code v2.1.224 on August 8, adding cross-session messaging that lets different sessions send messages and coordinate work.
On August 8, Anthropic announced on X that Claude Code v2.1.224 is now generally available. The release introduces cross-session messaging that lets Claude Code sessions running on macOS and Linux send messages to one another, share findings, answer questions, and coordinate work.
The feature maintains strict safety limits on permissions. It cannot be used to approve permission requests or change global configuration. Commands like /compact are transmitted as plain text rather than executed. If the receiving session needs to take action based on the message, it still asks the user for explicit approval.
Anthropic outlined typical use cases including handing off investigation findings, coordinating parallel worktrees, getting status updates on long-running tasks, and replying across machines. Users do not need to compose specific message structures; providing the core intent is enough for Claude to draft the full message.
The release also adds ListAgents for cross-session agent discovery, dialogExpiry and crossSessionInbound settings for managing inter-session delivery, plus an archive plugin source for installing zip-based plugins over HTTPS with optional SHA-256 verification. Sandbox credential-masking now supports JWT-aware masking and AWS SigV4 re-signing for structured environment values.